APU CONTROLS - ELECTRONIC CONTROL UNIT - OIL QUANTITY
January 1, 2004
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FUEL QUANTITY INDICATING SYSTEM
(FQIS)

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January 1, 2004
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
FUEL INDICATING - FQIS BITE TEST MAIN MENU PAGES
General
You use the control display units (CDU) to do troubleshooting on the fuel indicating system. The CDU shows real time and recorded system fault data. The fuel quantity processor monitors and stores the data that shows on the CDU. You can only use the CDU to see the FQIS BITE test pages when the airplane is on the ground.
Main Menu Pages
The FQIS BITE test main menu pages allow you to select other FQIS BITE test pages. These are the FQIS BITE test pages:
-Current status
-Inflight faults
-Ground test
-Ident/config
-Input monitoring
-Erase fault history.

Current Status Page
The current status page shows fuel indication system faults that currently exist on the airplane.
Inflight Faults Pages
The inflight faults pages show recorded fuel indication system faults from previous flight legs.
Ground Test Pages The ground test pages allow you test the FQIS processor. Ident/Config Pages The ident/config pages show data from the configuration of the fuel
quantity processor unit. Input Monitoring Pages The input monitoring pages show real time fuel quantity data for each
fuel tank. Erase Fault History Pages The erase fault history pages allow you to erase recorded fault data
from the fuel quantity processor memory.
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FUEL INDICATING -FQIS BITE TEST MAIN MENU PAGES
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737-700 MAINTENANCE TRAINING MANUAL
FUEL INDICATING - FQIS BITE TEST CURRENT STATUS PAGE
Current Status Page
The current status page shows faults that are currently active. As the number of active faults increases, the number of current status pages increase. You can access all current status pages to see all current faults. A number shows which current status page you are on as well as the total number of current status pages you can access. For each fault, this data shows:
　
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